0.75% and 1%, the points on which experts suggest the chain replacement.

Easy to use, very durable.

Accurately measures wear stretching on bike chains.

Chain Wear Indicator Tool 0.75 1.0% Wear.

Weight: 45gSize: 14cmSatin chrome for corrosion resistanceCompatible with single and multi speed settings

Note: The chain wear rule, the new chain is not blocked. The chain that goes up for a while, the innermost part of the insert, shows the most wear. 0.75 can be blocked, indicating that the chain is more worn. If 1.0 can also be blocked, the recommendation of the channel is to replace it. Such a chain can slide, especially when it is difficult.--------------------------------------------------------Package Including1*Chain Ruler